Machine for producing piston-rings



F. RAY. MACHINE FOR PRODUCING PISTON RINGS APPLICATION mm mm: 15. ms. nsnzwso (m. 12. ms.

- UNITED STATES PATENT OFFICE.

FREDERICK BAY, OF SHORT HILLS, NEW JERSEY.

MACHINE FOR PRODUCING PISTON-RINGS.

Specification of Letters Patent.

Patented May 20, 1919.

Application filed June 15, 1916, Serial No. 103,795. Renewed October 12, 1918. Serial No. 257,884.

To all whom it may concern Be it known that I, FREDERICK RAY, a citizen of the United States, residing at Short Hills, Essex county, State of New Jersey, have invented certain new and useful Improvements in Machines for Producing Piston-Rings, of which the following 1s a specification.

This invention relates to machines for producing metal rings and particularly plston rings which exert a uniform, radial pressure. The rings may be of uniform cross-section and the object of the invention is to provide a machine that will operate upon the ring blanks so as to distort the metal along the circumference of the rin so that the ring will exert a circumferentially uniform, radial pressure under working conditions, when mounted upon a piston and within a cylinder.

The invention consists in a knurling machine in which a knurling tool is caused to distort the metal of the ring by varying the load on the tool in accordance with a predetermined law. By making use of a rota knurling tool which can be operated at a igh speed compared to reciprocating hammers, an increased output can be obtained.

Referring now to the drawings which are part of the specification and attached hereto;

Figure 1 represents a vertical transverse section of the machine; and

Fig. 2.illustrates a front elevation.

The machine consists of a frame 1 on which is mounted a chuck which in the form of the invention illustrated in the drawin is rotated bv gearing. The form t of the c uck may be Widely varied. As illustrated, it consists of a rin seat 2 and a face plate 3. Theface p ate is clamped against the rin by screw piece 4 mounted in the main y portion 5 of the chuck.'

The gearing for rotating the chuck consists of spur ears 6 and 7, the latter being mounted on t e drive shaft 8 which carries drivin pulley 9. The knurlin tool 10 acts I upon t e inner circumference o the ring 11. e 12 The knurling tool is carried b a sli mounted on suitable vertical gui cs 13. The face of the knurl is provided with a lurality of teeth 14 which in the form i ustrated are parallel and equally spaced a art.

Means are provided for varym the oad it .upon the knurl in accordance wit a predetermined law. meene'may be varied.

In the best embodiment of the invention, a cam 15 is used attached to the rotating chuck 5 which acts upon and moves lever 16 through roller 17. The lever 16 is rigidly attached to the shaft 18 supported in bearings carried by an extension 19 of the frame and is rigidly connected to the pinion 20. The pinion 20 meshes with the rack 21 which is guided on the back by roller 22 carried in earings in an extension 23 of the frame.

A spring 24 is utilized to receive and transmit the varying load to the knurl. By means of the spring, the load exerted on the slide carrying the knurl varies in proportion to the compression or extensionof the spring which in turn is proportional to the movement of the actuating lever, thus making the law of variation in pressure on the knurl 1n value of the load can be varied to produce rings of different radial reactions. In the form of the invention illustrated, thespring is interposed between the'rack 21 and the slide 12 carrying the knurl 10. The sprin is held between two caps 25 and 26, a bo t 27 preventing undue expansion pf the spring. The cap 26 rests upon the slide 12.

Upon rotating the chuck 5, the spring 24 is compressed in proportion to the motion of the lever 16. The motion of the slide carrying the knurling tool is comparatively slight with respect to the compression of the spring, hence does not substantially affect the load or force exerted by the spring. Moreover, a wide range of movement may be imparted to the roller carrying end of lever 16' and its action transmitted through the spring with a resultant slight but effective motion of the knurlingtool. By the means described the knurling tool 10is caused to exert a pressure upon the circumference of the ring resulting in a distortion of this surface in accordance with a predetermined law of variation.

The law of the cam 9 and its resultant shape is determined by means of a gaging.

this means the correct law of the cam is obtained so that the ring produced by the machine will exert a uniform, radial reaction or pressure at all points of the circumference.

The knurling tool may be provided with any desired number of projections or teeth 14:. The knurling tool may be caused to rotate by the friction of the ring upon the knurl. In the form of the invention illustrated, however, suitable means are provided for rotating the knurling tool so that its surface speed is equal to that of the inner circumference of the ring carried in its rotating chuck. This insures a uniform spacing of the impressions of the teeth of the knurl. As shown, gears 28 and 29 rotate the knurl from the shaft 8. The gear 28 is mounted on shaft 30 which carries the knurl 1 0, the'shaft in turn being mounted in bearings 31 of slide 12. The radial motion of the knurling tool 10 is so slight that the teeth of the ears 28 and 29 remain in engagement. tion of the chuck and suitable driving means are provided to give the chuck one revolu-- tion after which the machine is stopped and the ring removed.

Havingthus described my invention, its operation-will be clear.- A ring is placed into the chuck with the face plate screwed home so as to clamp it securely and the machine started into operation. The ring is then knurled by a single rotation of thering, a knurling tool and means for varying the load on said tool in accordance with a predetermined law.

2. In a knurling machine for producing piston-rings which exert an outward radial pressure, the combination of a chuck for holding the ring, a knurling tool, means for producing relative rotation between the ring and the tool and means for varying the load on said tool in accordance with a predetermined law.

i 3. In a knurling machine for producing piston rings which exert a uniform, radial ressure; the combination of a chuck for olding the mug, a knurling tool, means for rotating the chuck, and means for varying he ring is knurled after one revolu- I the load on said tool in accordance with a predetermined law.

4. In a knurling machine for producing piston rings which exert a uniform, radial pressure, the combination of a knurling tool,

a chuck for holding the ring, means for rotating the chuck, means for rotating the tool and means for varying the load on said tool in accordance with a predetermined law.'

.5. In a knurling machine for producing piston rings which exert a uniform, radial. pressure, the combination of a knurling tool, a chuck, a cam shaped to conform to a predetermined law and connections between said cam and tool whereby the load on the tool is varied in accordance with said law.

6. In a knurling machine for producing piston rings which exert an outward radial pressure, the combination of a chuck for holding the ring,'a spring pressed knurlin tool and means for varying the force exerted by said spring on said tool according to a predetermined law.

7. In a knurling machine for producing piston rings which exert an outward radial pressure, the combination of a chuck for olding the ring, a spring pressed knurling tool, means for rotating the chuck, and means for varying the force exerted by said spring on said tool according to a predetermined law.

8. In a knurling machine for producin piston rings which exert an outward radiapressure, the combination of a chuck for holding the ring, a spring pressed knurling tool, means for rotating the chuck and a cam and link for varying the force exerted by said spring on said tool according to a predetermined law. V

9. In a knurling machine for producing piston rings which exert a uniform, radial pressure, the combination of a chuck for holding the ring, a spring pressed slide carrying the knurling tool, means for rotating the chuck and a cam and connections including a rack and pinion for varying the force exerted by said spring on said slide according to a predetermined law.

10. In a knurling machine for producing rings which exert a uniform, radial pressure, the combination of a chuck for holding the ring, a knurling tool having a plurality of uniformly arranged parallel ribs on its face, and means for varying the loadon said tool in accorda nce with a predetermiffed law.

.11. In a knurling machine for producin' piston rings which exert a uniform outwar radial pressure, the combination of a chuck for holding the ring, a spring pressed slide carrying the knurlin tool, standards forming ways for said sli e, a drive shaft, gears between said shaft and said chuck for rotat- .ing it, a cam attached to said chuck andconvarying the force exerted by said sprin on said slide according to a predetermined aw. 12. In a machine for producing rings which exert a uniform radial pressure, the combination of a knurling tool having a plurality of uniformly arranged teeth on its peripheral face to operate upon the inner circumference of the ring, means for supporting a divided ring against the action of the knurling tool, and means for varying the pressure between the knurling tool and ring in accordance with a predetermined law.

13. In a machine for producing rings which exert a uniform radial pressure, the combination of a ring chuck, a knurling tool, 15 a cam, and connections whereby the cam controls the pressure between the knurling tool and the ring.

In testimony whereof, I have signed my name to this specification, in the presence of 20 two subscribing witnesses.

FREDERICK RAY.

Witnesses:

' LOUELLA F. Lrmmz, J. HOWARD BREESE. 

